Mohit Kataria created OAK-9651:
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             Summary: Protection against very large queries
                 Key: OAK-9651
                 URL: https://issues.apache.org/jira/browse/OAK-9651
             Project: Jackrabbit Oak
          Issue Type: Improvement
            Reporter: Mohit Kataria


There are cases where system runs out of memory because very large queries (5 
MB / around 30'000 lines of text each) were run and QueryStatsMbean consuming 
huge memory.

We should have some protection against such queries. Options are:
 * We can log a warning if the query is longer than e.g. 100 KB.
 * A query longer than e.g. 1 MB might just throw an exception.
 * The query statistic should probably not collect statistic for such long 
queries. We could shrink the query text in the statistic collection to e.g. at 
most 2 KB per query. Truncating it, or, probably better, only retaining the 
first and last 1 KB.



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